Ukrainian police today freed the remaining hostages being held in a post office by an man believed to be strapped with explosives. The police arrested the assailant after an hours-long standoff in the city of Kharkiv. This is informed by Ukrainian President Petro Poroshenko via Twitter. Interior Minister Arsen Avakov has published a picture of the man, with blood streaming down his face, being held by a policeman. None of the hostages were harmed. <br/>'<br/>In earlier statements, police said the man had entered the post office wearing a mask and taken 11 people hostage with the intention of robbing the place. Five of the hostages — three women and two children — were released early.<br/>'<br/>The man at one point voiced concern about the recent prisoner exchange between the Ukrainian authorities and pro-Russian separatists and thought more prisoners should have been released, police said.